In several cases, Class::MakeMethods provides functionality closely equivalent to that of an existing module, and it is simple to map the existing module's interface to that of Class::MakeMethods.

Class::MakeMethods::Emulator provides emulators for Class::MethodMaker, Class::Accessor::Fast, Class::Data::Inheritable, Class::Singleton, Class::Struct, accessors, and mcoder, each of which passes the original module's test suite, usually requiring only the addition of a a single line to each test, activating the emulation module.

Beyond demonstrating compatibility, these emulators also generally indicate the changes needed to switch to direct use of Class::MakeMethods functionality, illustrate commonalities between the various modules, and serve as a source for new ideas that can be integrated into Class::MakeMethods.